HP EliteDesk 800 G2 Desktop Mini Hardware Reference Manual page 27

c. Lift the fan out of the chassis (3).
11. Remove the three screws securing the HDD cage to the chassis (1).
12. Pull the hood sensor up and off the HDD cage (2).
13. Lift the HDD cage out of the chassis (3).
Replacing an M.2 PCIe solid state drive (SSD) 21